5 things to know about UV light technology and COVID-19:It does kill viruses, but stay clear of retailers that claim to sell these devices for use at home

Ultraviolet light is at least as old as the sun, but as recently as 2020 humans continue to find new ways to harness its power. One particular band of UV radiation, UVC, is a known disinfectant that has been used for decades to sterilize air, water and nonporous surfaces.